A lion yawns at a nature reserve on the outskirts of Pretoria, South Africa, on Tuesday. Enrique Marcarian/Reuters
A fan reacts before the 2010 World Cup second round soccer match between Paraguay and Japan at Loftus Versfeld stadium in Pretoria, South Africa, on June 29. Eddie Keogh/Reuters
Spanish bullfighter Enrique Ponce waits for the start of a bullfight at the El Plantio bullring in Burgos, Spain, on June 29. Felix Ordonez/Reuters
Russia's Anna Kurnikova reacts during her Ladies Invitation doubles match with Switzerland's Martina Hingis against Britain's Anne Hobbs and Samantha Smith at the 2010 Wimbledon tennis championships in London on Tuesday. Phil Noble/Reuters
A protester throws a stone at riot policemen during a rally against government austerity measures in Athens on Tuesday. Greek riot police fired tear gas at protesters chanting, 'Burn parliament,' hours before lawmakers were to begin debating a sweeping pension reform to help tackle the country's huge debt crisis. John Kolesidis/Reuters
Gen. David Petraeus testifies at his Senate Armed Services Committee confirmation hearing to become commander of US forces in Afghanistan on Capitol Hill on June 29. Kevin Lamarque/Reuters
Performers from CARGO, a large-scale outdoor performance group, link together to spell out Mela during a photocall for the forthcoming Mela Festival in Edinburgh, Scotland, on Tuesday. The Edinburgh Mela Festival was set up by the city's minority ethnic communities and takes place from August 6-8. David Moir/Reuters
Spanish fans react as they watch the World Cup soccer match against Portugal during an outdoor television screening in Madrid on June 29. Andrea Comas/Reuters
Students attend class at Mama Ayser, a private school in Baghdad on Tuesday. Once banned under Saddam Hussein, private schools have flourished in Iraq since the 2003 US-led invasion, as Iraqis become increasingly frustrated with their government's failure to provide basic services. Mohammed Ameen/Reuters
Vehicles and paramilitary police squads gather for rescue operations after a rain-triggered landslide struck the village of Dazhai in southwest China's rain-hit Guizhou Province on Tuesday. AP
Swelling cities are strategizing, innovating, and proactively investing in ways to nimbly operate in the face of growing threats such as climate change, transportation, and housing.
BySophie Hares, Reuters
Urban resilience, no longer just a buzzword, is fast becoming part of the fabric of cities around the world, which need to ramp up strategies to ensure the wellbeing of their booming populations in the face of growing threats, experts say.